/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.editor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.LocalVariableInfoVisitor;

/**
 * This LocalVariableInfoVisitor adds all local variables that it visits to the given target local variable table
 * attribute.
 */
public class LocalVariableInfoAdder implements LocalVariableInfoVisitor {
    private final ConstantAdder constantAdder;
    private final LocalVariableTableAttributeEditor localVariableTableAttributeEditor;

    /**
     * Creates a new LocalVariableInfoAdder that will copy local variables into the given target local variable table.
     */
    public LocalVariableInfoAdder(ProgramClass targetClass,
        LocalVariableTableAttribute targetLocalVariableTableAttribute) {
        this.constantAdder = new ConstantAdder(targetClass);
        this.localVariableTableAttributeEditor =
            new LocalVariableTableAttributeEditor(targetLocalVariableTableAttribute);
    }

    // Implementations for LocalVariableInfoVisitor.

    public void visitLocalVariableInfo(Clazz clazz, Method method, CodeAttribute codeAttribute,
        LocalVariableInfo localVariableInfo) {
        // Create a new local variable.
        LocalVariableInfo newLocalVariableInfo = new LocalVariableInfo(localVariableInfo.u2startPC,
            localVariableInfo.u2length, constantAdder.addConstant(clazz, localVariableInfo.u2nameIndex),
            constantAdder.addConstant(clazz, localVariableInfo.u2descriptorIndex), localVariableInfo.u2index);

        newLocalVariableInfo.referencedClass = localVariableInfo.referencedClass;

        // Add it to the target.
        localVariableTableAttributeEditor.addLocalVariableInfo(newLocalVariableInfo);
    }
}